Over 50% of Toronto, at least, is born outside of Canada and even then immigrants were overrepresented in my CS cohort at Waterloo in 2014. So it seems plausib

Over 50% of Toronto, at least, is born outside of Canada and even then immigrants were overrepresented in my CS cohort at Waterloo in 2014. So it seems plausible -- but these aren't people cynically exploiting Canada as a hop on the way to the US, they're people who were born outside Canada but moved to Canada as children and grew up Canadian.